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Benzene diazonium salt with cuprous cyanides in presence of potassium cyanide gives cyanobenzene (benzene nitrile)Cyanobenzene formed can be converted to benzoic acid by hydrolysis. This method is used to introduce-COOH group in aromatic ring.

Replacement reaction of benzene diazonium chloride by OH - ion

Aromatic diazonium salts are unstable and hence easily decompose when warned with water forming phenol and nitrogen gas.